US5590210A - Loudspeaker structure and method of assembling loudspeaker - Google Patents

Loudspeaker structure and method of assembling loudspeaker Download PDF

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Publication number
US5590210A
US5590210A US08/517,352 US51735295A US5590210A US 5590210 A US5590210 A US 5590210A US 51735295 A US51735295 A US 51735295A US 5590210 A US5590210 A US 5590210A
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US
United States
Prior art keywords
plate
magnets
loudspeaker
magnetic circuit
holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/517,352
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English (en)
Inventor
Shinta Matsuo
Yoshio Sakamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JVCKenwood Corp
Original Assignee
Kenwood KK
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Filing date
Publication date
Application filed by Kenwood KK filed Critical Kenwood KK
Priority to US08/517,352 priority Critical patent/US5590210A/en
Priority to US08/713,350 priority patent/US5701357A/en
Application granted granted Critical
Publication of US5590210A publication Critical patent/US5590210A/en
Assigned to JVC Kenwood Corporation reassignment JVC Kenwood Corporation MERGER (SEE DOCUMENT FOR DETAILS). Assignors: KENWOOD CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49005—Acoustic transducer

Definitions

  • the present invention relates to a loudspeaker structure and a method of assembling a loudspeaker, for a loudspeaker of the type that a magnetic circuit generating a repulsion magnetic field (hereinafter called "repulsion magnetic circuit") is generated by two magnets with the same polarity being faced with each other, a magnetic material plate is interposed therebetween, and a voice coil is placed in the magnetic field at the outer peripheral area of the plate.
  • repulsion magnetic circuit a magnetic circuit generating a repulsion magnetic field
  • magnets 1 and a plate 2 are bonded and fixed together as shown in FIG. 8A, or magnets 1 and a plate 2 mounted on a holder 4 are fastened and fixed by a screw 12 as shown in FIG. 8B.
  • a support shaft 4a is formed integrally with a holder 4 and holes of magnetic circuit components are fitted around the support shaft to fix them by using a screw or to bond and fix them, as shown in FIG. 8C.
  • the lower magnet, plate, and upper magnet are bonded together in this order and disposed on the upper surface of the holder 4.
  • each component has no structure for helping align its center. It is therefore difficult to assemble them.
  • the length of the screw 12 is required to be a length corresponding to the total thickness of the two magnets 1 and plate 2 plus the length of an internal thread 4d.
  • Using this long screw makes it difficult to align each magnetic circuit component at a high precision, and also poses some problem of the performance of a magnetic circuit itself. Furthermore, if strong magnets 1 or a thin plate 2 are used, a stronger repulsion force is generated. It becomes therefore difficult to assemble them by using a screw having a limited length.
  • center holes formed in the plate 2 and magnets 1 have some play relative to the screw 12. It is therefore very difficult to align the centers of the magnets 1 and plate 1. A poor center alignment generates an uneven distribution of magnetic fluxes supplied to a voice coil, causing a degraded sound quality.
  • the support shaft 4a or screw 12 is inserted into the magnet, plate, and magnet, in this order.
  • the length of the support shaft 4a or screw 12 is limited and set to the length necessary only for fastening the magnetic circuit components. This length is short from the viewpoint of an assembly work.
  • a support shaft is formed on a holder for holding magnetic circuit components, the magnets and plate are disposed on the support shaft with position alignment, the support shaft is formed with a mount for a fastening member such as a thread, a guide hole, a projection, and a recess, and the magnets and plate are fastened and fixed by coupling the fastening member to the mount.
  • a fastening member such as a thread, a guide hole, a projection, and a recess
  • various types of diffusers can be used depending upon use purposes.
  • a support shaft is formed on a screw or a diffuser and mounted on the holder.
  • a pole type magnetic circuit insertion jig having the same diameter as the support shaft is inserted into a space defined by the mount for the fastening member such as a thread, a guide hole, a projection, and a recess.
  • an outer thread of the diffuser is engaged with an inner thread formed on the support shaft.
  • Diffusers made of different materials and having different shapes are prepared for replacement thereof. If a chamber is mounted, the magnetic circuit components are fixed by using a nut threaded into an outer thread formed on the head of the support shaft.
  • a support shaft may be formed depending from the bottom of a diffuser or a screw to engage it with an inner thread formed in the bottom of the holder.
  • the repulsion magnetic circuit can be easily and securely fixed.
  • changing the material and shape of a diffuser or by interposing a heat dissipating spacer between a diffuser and magnetic circuit components it is possible to adjust the characteristics and sound quality of a loudspeaker or adjust heat dissipation.
  • a chamber can be mounted by using a screw having a wide and thin flange in place of a diffuser.
  • a support shaft is formed depending from the bottom of a diffuser or a screw.
  • the magnetic circuit insertion jig is used. By inserting the magnets and plate one after another separately into the holder, it is possible to weaken the influence of an attraction force or repulsion force between these components, realizing a simple assembly work.
  • FIGS. 1A and 1B are cross sectional views showing the structure of a loudspeaker with a diffuser being mounted, according to an embodiment of the present invention.
  • FIG. 2 is a cross sectional view showing the structure of a loudspeaker using a screw as a fastening member.
  • FIG. 3 is a cross sectional view showing the structure of a loudspeaker wherein a heat dissipating spacer is interposed between a repulsion magnetic circuit and a diffuser.
  • FIG. 4A is a cross sectional view showing the structure of a loudspeaker wherein a support shaft is formed integrally with a diffuser
  • FIG. 4B is a cross sectional view showing the structure of a loudspeaker wherein an external thread is formed at the head portion of a support shaft and an internal thread is formed on the diffuser side
  • FIG. 4C is a cross sectional view showing the structure of a loudspeaker wherein a nut is used as a fastening member.
  • FIG. 5 is a cross sectional view showing the structure of a loudspeaker with a different mount configuration of a diffuser.
  • FIG. 6 is a schematic diagram illustrating a method of assembling a loudspeaker according to an embodiment of the invention, wherein a magnetic circuit insertion jig is used.
  • FIG. 7A shows the shapes of normal type diffusers
  • FIG. 7B shows the shapes of diffusers with a heat dissipating function
  • FIG. 7C shows the shapes of separate type diffusers.
  • FIGS. 8A is a cross sectional view showing the structure of a conventional loudspeaker wherein magnets and a plate are bonded and fixed without using a support shaft
  • FIG. 8B is a cross sectional view showing the structure of a conventional loudspeaker wherein small holes are formed in magnetic circuit components to fasten them by a screw
  • FIG. 8C is a cross sectional view showing the structure of a conventional repulsion magnetic circuit type loudspeaker proposed by the present inventors.
  • FIG. 1 is a cross sectional view showing the structure of a loudspeaker using a repulsion magnetic circuit.
  • the repulsion magnetic circuit is formed by two magnets 1 and 1 with the same polarity being faced with each other and a plate 2 made of magnetic material such as iron and interposed between the two magnets.
  • a voice coil 3 is disposed in a magnetic field at the outer circumferential area of the plate.
  • the magnets 1 and plate 2 are fitted around a support shaft 4a integrally formed with a holder 4.
  • a diffuser 5 formed with an external thread 5a is mounted on the magnets 1 and 1 and plate 2 for fixing them.
  • the diffuser 5 can be dismounted and has a shape such as a semisphere and a bomb to be determined by a sound quality, frequency characteristics, and the like, and is made of material such as metal, resin, and wood.
  • a chamber 8 if a chamber 8 is to be mounted, the magnetic circuit components are fixed by a screw 6 having a wide flange.
  • the diffuser 5 may be made of metal such as aluminum and copper or resin, or as shown in FIG. 3 a spacer 9 made of material having a good heat dissipation effect is sandwiched between the magnetic circuit and the diffuser 5. It is also effective that a heat dissipation area is made large by providing the diffuser 5 with fins 5e such as shown in FIG. 7B.
  • the diffuser 5 may be divided into a base 5A and a head 5B as shown in FIG. 7C.
  • the magnetic circuit components may be fastened by introducing the following structure.
  • a support shaft 5b is formed depending from the bottom of a diffuser 5, and inserted into the magnetic circuit components to engage it with an inner thread 4d formed in a holder 4.
  • the support shaft 5b can be inserted into the center holes of the magnets 1 and plate 2 in tight contact therewith. Accordingly, the position alignment of the magnets 1 and plate 2 can be performed precisely.
  • an external thread 4e is formed in the head portion of the support shaft 4a of the holder 4, and a diffuser 5 formed with an internal thread 5d is mounted on the holder 4. If a chamber 8 is to be mounted, the magnetic circuit components are fixed by a nut 7.
  • a through hole 5c is formed in a diffuser 5, and a fixing screw 11 is threaded into an internal thread 4b of the support shaft 4a to squeeze and fix the magnetic circuit components between the diffuser 5 and the holder 4.
  • a mount for the fastening member formed on the support shaft 4a may be any other lock or fastening mechanism.
  • one of a pair of projection and recess may be used to provide the lock or fastening mechanism.
  • a magnetic circuit insertion jig 10 is inserted into the inner thread 4b hole and guide hole 4c of the support shaft 4a.
  • This jig 10 functions as a long support shaft into which a magnet 1, a plate 2, and then another magnet 1 are inserted. Since the long support shaft is used, the insertion work is easy. Assembly becomes easy by inserting the magnetic circuit components one after another separately, without being influenced by an attraction force of the magnets. There is no fear that the magnet jumps out and attaches to the plate when the latter is inserted, or that fingers are squeezed between them.
  • the loudspeaker structure of this invention position alignment of magnets and a plate constituting a repulsion magnetic circuit can be reliably ensured and the magnetic circuit components are securely fastened and fixed without using adhesive agent. Accordingly, there is no fear that magnets or the like are jumped out by a repulsion magnetic force.
  • the loudspeaker assembly method of this invention it is possible to ensure position alignment of the magnetic circuit components by using the support shaft of the holder. It is also possible to firmly and reliably fasten the magnetic circuit components without using adhesive agent by coupling a fastening member such as a screw and a diffuser to a mount formed on the support shaft. By using the magnetic circuit insertion jig, the assembly of the magnetic circuit components becomes safe and smooth.
  • the assembly method using the magnetic circuit insertion jig is applicable also to assembly a loudspeaker having a modified structure such as a support shaft provided on the diffuser side.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing & Machinery (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US08/517,352 1993-04-09 1995-08-21 Loudspeaker structure and method of assembling loudspeaker Expired - Lifetime US5590210A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US08/517,352 US5590210A (en) 1993-04-09 1995-08-21 Loudspeaker structure and method of assembling loudspeaker
US08/713,350 US5701357A (en) 1993-04-09 1996-09-13 Loudspeaker structure with a diffuser

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP5-107367 1993-04-09
JP5107367A JP2860225B2 (ja) 1993-04-09 1993-04-09 スピーカの構造及びその組立方法
US22396894A 1994-04-06 1994-04-06
US08/517,352 US5590210A (en) 1993-04-09 1995-08-21 Loudspeaker structure and method of assembling loudspeaker

Related Parent Applications (1)

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US22396894A Continuation 1993-04-09 1994-04-06

Related Child Applications (1)

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US08/713,350 Division US5701357A (en) 1993-04-09 1996-09-13 Loudspeaker structure with a diffuser

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US5590210A true US5590210A (en) 1996-12-31

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US08/517,352 Expired - Lifetime US5590210A (en) 1993-04-09 1995-08-21 Loudspeaker structure and method of assembling loudspeaker
US08/713,350 Expired - Lifetime US5701357A (en) 1993-04-09 1996-09-13 Loudspeaker structure with a diffuser

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US08/713,350 Expired - Lifetime US5701357A (en) 1993-04-09 1996-09-13 Loudspeaker structure with a diffuser

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US (2) US5590210A (de)
EP (1) EP0622971B1 (de)
JP (1) JP2860225B2 (de)
DE (2) DE69411987T2 (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5682436A (en) * 1994-06-06 1997-10-28 Kabushiki Kaisha Kenwood Multipoint driving loudspeaker having repulsion magnetic-type driving unit
US5894264A (en) * 1997-07-18 1999-04-13 Caterpillar Inc. Apparatus for generating an audible tone
US5898786A (en) * 1996-05-10 1999-04-27 Nokia Technology Gmbh Loudspeakers
US5953436A (en) * 1997-07-18 1999-09-14 Caterpillar Inc. Apparatus for generating an audible tone
US6343136B2 (en) * 1997-03-25 2002-01-29 Pioneer Electronic Corporation Speaker apparatus and manufacturing method thereof
US6774510B1 (en) * 2000-10-25 2004-08-10 Harman International Industries, Inc. Electromagnetic motor with flux stabilization ring, saturation tips, and radiator
US20050084130A1 (en) * 2002-12-03 2005-04-21 Kiyoshi Yamagishi Voice coil insertion jig, speaker producing method using the jig, and speaker produced by using the jig
US20060251286A1 (en) * 2005-04-13 2006-11-09 Stiles Enrique M Multi-gap air return motor for electromagnetic transducer
US20070160257A1 (en) * 2005-04-13 2007-07-12 Stiles Enrique M Axial magnet assisted radial magnet air return motor for electromagnetic transducer
US20070223777A1 (en) * 2006-03-22 2007-09-27 Harman International Industries Incorporated Loudspeaker having an interlocking magnet structure
EP2389013A1 (de) * 2010-05-20 2011-11-23 Harman Becker Automotive Systems GmbH Lautsprecher mit Verriegelungsmagnetstruktur
EP2768245A1 (de) * 2013-02-13 2014-08-20 Harman International Industries Ltd. Magnetmontageanordnung für einen Lautsprecher und Verfahren zur Demontage einer Magnetmontageanordnung
US20170347197A1 (en) * 2016-05-26 2017-11-30 AAC Technologies Pte. Ltd. Speaker
US10237636B1 (en) * 2017-09-20 2019-03-19 Mitek Corp., Inc. Small ceiling speaker system
US11363360B2 (en) * 2019-06-26 2022-06-14 Goertek Inc. Acoustic reflector and acoustic electronics device

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3260062B2 (ja) * 1995-09-04 2002-02-25 株式会社ケンウッド スピーカ
DE19808688C2 (de) * 1997-03-05 2002-12-12 Harman Audio Electronic Sys Magnetsystem und Verfahren zu seiner Herstellung
JP4473428B2 (ja) * 2000-08-07 2010-06-02 パイオニア株式会社 スピーカ装置
US6580803B1 (en) * 2000-10-06 2003-06-17 Meiloon Industrial Co., Ltd. Structure for changing sound quality of speaker
US20060008109A1 (en) * 2004-07-07 2006-01-12 Huang Maurice R Loudspeaker structure
JP4465244B2 (ja) * 2004-08-25 2010-05-19 パイオニア株式会社 スピーカ装置及びスピーカ装置の製造方法
US20080247583A1 (en) * 2006-01-13 2008-10-09 Lamarra Frank Speaker, Method of Manufacture Therefore, and Speaker Attenuation System, Method and Apparatus
JP4739064B2 (ja) * 2006-02-27 2011-08-03 ミネベア株式会社 スピーカ
KR101368036B1 (ko) 2007-10-09 2014-02-26 엘지전자 주식회사 스피커 장치
FR2955446B1 (fr) 2010-01-15 2015-06-05 Phl Audio Transducteur electrodynamique a dome et suspension flottante
FR2955445B1 (fr) 2010-01-15 2013-06-07 Phl Audio Transducteur electrodynamique a dome et suspension interne
FR2955444B1 (fr) 2010-01-15 2012-08-03 Phl Audio Systeme de haut-parleur coaxial a chambre de compression
FR2955447B1 (fr) * 2010-01-15 2012-08-03 Phl Audio Transducteur electrodynamique comprenant un guide d'ondes acoustiques assurant une dissipation thermique

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US3201529A (en) * 1962-11-16 1965-08-17 Philip C Surh Dynamic speaker
US3898393A (en) * 1974-02-04 1975-08-05 Clifford B Digre Magnet centering device and shield
US4256930A (en) * 1978-02-22 1981-03-17 Tannoy Products Limited Loudspeaker having improved magnetic assembly
GB2155733A (en) * 1983-12-03 1985-09-25 Pioneer Electronic Corp Voice coil speaker
US4965839A (en) * 1988-06-02 1990-10-23 Boaz Elieli Electro acoustic transducer and loudspeaker

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DE3730305C1 (de) * 1987-09-10 1989-03-23 Daimler Benz Ag Lautsprecher
DE3936639C1 (en) * 1989-11-03 1991-03-07 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Permanent magnet arrangement e.g. for vehicle loudspeaker - includes associated oscillatory coil arrangement to drive loudspeaker diaphragm
DE4021651C1 (de) * 1990-07-07 1991-06-27 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De
US5594805A (en) * 1992-03-31 1997-01-14 Kabushiki Kaisha Kenwood Loudspeaker

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201529A (en) * 1962-11-16 1965-08-17 Philip C Surh Dynamic speaker
US3898393A (en) * 1974-02-04 1975-08-05 Clifford B Digre Magnet centering device and shield
US4256930A (en) * 1978-02-22 1981-03-17 Tannoy Products Limited Loudspeaker having improved magnetic assembly
GB2155733A (en) * 1983-12-03 1985-09-25 Pioneer Electronic Corp Voice coil speaker
US4965839A (en) * 1988-06-02 1990-10-23 Boaz Elieli Electro acoustic transducer and loudspeaker

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5682436A (en) * 1994-06-06 1997-10-28 Kabushiki Kaisha Kenwood Multipoint driving loudspeaker having repulsion magnetic-type driving unit
US5898786A (en) * 1996-05-10 1999-04-27 Nokia Technology Gmbh Loudspeakers
US6817084B2 (en) 1997-03-25 2004-11-16 Pioneer Electronic Corporation Method for manufacturing a speaker apparatus
US6343136B2 (en) * 1997-03-25 2002-01-29 Pioneer Electronic Corporation Speaker apparatus and manufacturing method thereof
US20020064294A1 (en) * 1997-03-25 2002-05-30 Pioneer Electronic Corporation Speaker apparatus and manufacturing method thereof
US5894264A (en) * 1997-07-18 1999-04-13 Caterpillar Inc. Apparatus for generating an audible tone
US5953436A (en) * 1997-07-18 1999-09-14 Caterpillar Inc. Apparatus for generating an audible tone
US6774510B1 (en) * 2000-10-25 2004-08-10 Harman International Industries, Inc. Electromagnetic motor with flux stabilization ring, saturation tips, and radiator
US20040239193A1 (en) * 2000-10-25 2004-12-02 Jerry Moro Electromagnetic motor with flux stabilization ring, saturation tips, and radiator
US20050179326A1 (en) * 2000-10-25 2005-08-18 Harman International Industries Incorporated Electromagnetic motor with flux stabilization ring, saturation tips, and radiator
US7012345B2 (en) 2000-10-25 2006-03-14 Harman International Industries, Inc. Electromagnetic motor with flux stabilization ring, saturation tips, and radiator
US7057314B2 (en) 2000-10-25 2006-06-06 Harman International Industries, Inc. Electromagnetic motor system capable of removing heat away from its magnetic gap
US20050084130A1 (en) * 2002-12-03 2005-04-21 Kiyoshi Yamagishi Voice coil insertion jig, speaker producing method using the jig, and speaker produced by using the jig
US7350287B2 (en) * 2002-12-03 2008-04-01 Matsushita Electric Industrial Co., Ltd. Voice coil insertion jig, speaker producing method using the jig, and speaker produced by using the jig
US20070160257A1 (en) * 2005-04-13 2007-07-12 Stiles Enrique M Axial magnet assisted radial magnet air return motor for electromagnetic transducer
US20060251286A1 (en) * 2005-04-13 2006-11-09 Stiles Enrique M Multi-gap air return motor for electromagnetic transducer
US8315421B2 (en) 2006-03-22 2012-11-20 Harman International Industries, Incorporated Loudspeaker having an interlocking magnet structure
US20100310111A1 (en) * 2006-03-22 2010-12-09 Harman International Industries, Incorporated Loudspeaker having an interlocking magnet structure
US7894623B2 (en) 2006-03-22 2011-02-22 Harman International Industries, Incorporated Loudspeaker having an interlocking magnet structure
US20070223777A1 (en) * 2006-03-22 2007-09-27 Harman International Industries Incorporated Loudspeaker having an interlocking magnet structure
EP2389013A1 (de) * 2010-05-20 2011-11-23 Harman Becker Automotive Systems GmbH Lautsprecher mit Verriegelungsmagnetstruktur
WO2011144438A1 (en) * 2010-05-20 2011-11-24 Harman Becker Automotive Systems Gmbh Loudspeaker with interlocking magnet structure
CN102918873A (zh) * 2010-05-20 2013-02-06 哈曼国际工业有限公司 具有互锁磁体结构的扬声器
US20130070955A1 (en) * 2010-05-20 2013-03-21 Harman International Industries Ltd. Loudspeaker with interlocking magnet structure
EP2768245A1 (de) * 2013-02-13 2014-08-20 Harman International Industries Ltd. Magnetmontageanordnung für einen Lautsprecher und Verfahren zur Demontage einer Magnetmontageanordnung
US20170347197A1 (en) * 2016-05-26 2017-11-30 AAC Technologies Pte. Ltd. Speaker
US9998830B2 (en) * 2016-05-26 2018-06-12 AAC Technologies Pte. Ltd. Speaker
US10237636B1 (en) * 2017-09-20 2019-03-19 Mitek Corp., Inc. Small ceiling speaker system
US11363360B2 (en) * 2019-06-26 2022-06-14 Goertek Inc. Acoustic reflector and acoustic electronics device

Also Published As

Publication number Publication date
DE69411987D1 (de) 1998-09-03
DE622971T1 (de) 1995-06-08
DE69411987T2 (de) 1999-03-11
JPH06303696A (ja) 1994-10-28
EP0622971B1 (de) 1998-07-29
EP0622971A1 (de) 1994-11-02
US5701357A (en) 1997-12-23
JP2860225B2 (ja) 1999-02-24

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